Entering Your Own Equations - HP -225 Owner's Manual

Entering Your Own Equations
To enter an equation or expression into the list of equations:
1.
2.
3.
4.
Make sure the equation or expression follows the syntax rules
(see "The Syntax of Equations" on page 78).
Press @[ EQUATIONS].
If necessary, press (V] until the HP-22S displays
TYPE NEW EQN.
Type the equation.
B To type a variable, press or to give the keys their
letter assignments (the A..Z annunciator comes on). Then,
press a letter key.
B To type an operator, press an operator key—(+], (=], (], (],
or [Z] (*).
B To type a function, use the same keystrokes you would use to
execute the function in a calculation (see the tables on pages
80 through 83). For example:
To type: Press:
SINCAD (SIN] AQ]
ACOSH(A<B> B(wvr) @(Acos] (ReL) A (3] (sT0]) B [
SINCACOSCAY>> [SIN]@Acos] (sT0] A ] D]
COMB(T: Q) @(FRo8) {Cn.r} (STO) TP (Red @ )
Do a, b, or c:
a. Press to enter the equation.
b. Press to enter the equation and evaluate it.
C. Press @[SOLVE] to enter the equation and solve it for any
variable.
6: Evaluating and Solving Equations 73